By applying decades of research into the science of human attraction, Dr. Fisher believes that if McCain and Palin become America's next leaders, their similar and strong personalities may in fact work against them. Conversely, should Obama and Biden find their way to the White House, each may benefit from the other's strengths and perhaps compensate for each other's vulnerabilities.

"Obama is likely to be far more compassionate and emotionally expressive," said Dr. Fisher.  "And, with a high testosterone, experienced bulldog like Biden at his side, Obama may achieve the 'change' that he promises Americans."

According to Dr. Fisher, John McCain and Sarah Palin are both the high testosterone type. These men and women do what they like, when they like, how they like and tend to be daring, free-wheeling and original: mavericks.

"McCain ended up choosing a female version of himself which may not make for good political mating," states Fisher.

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